THE EFFECT OF THE NITROGEN DILUTION OF COAL SYNTHETIC GAS FUEL ON FLAME STABILITY AND NOz FORMATION
(0) Introduction Recently, IGCC(Integrated Gasification Combined Cycle) is being considered as next-generation clean coal technology because it shows high thermal efficiency and superior environmental performance compared with conventional fossil boiler. However, the syngas fuel produced from oxygen-blown coal gasification and gas clean-up processes of IGCC is mainly composed of hydrogen and carbon monoxide, so it is and nitrogen that result in low calorific value of the fuel, 1/4-1/5 times smaller than the natural gas. In addition, due to high content of hydrogen in fuel, the LCV coal derived gas shows very fast burning velocity, chemical reaction rate and high flame temperature1. As the consequence, flame instability can hardly be avoided in premixed burner and Nox emission is much higher than the natural gas case. For this reason, the most of combustion tests for LCV coal derived gas are conducted on the diffusion type bumers incorporating with nitrogen and/or steam dilution for Nox control2,3 while premix bumer technology being at the first stage of development. Therefore, for the efficient premixed combustor in IGCC, fundamental characteristics of combustion stability and Nox emission of the LCV fuel gas need to be investigated and would be useful in providing engineering guidelines for future R&D of IGCC gas turbine combustor. In the present experimental study, coal gas burner system is constructed with the flexibility in varying various fuel composition and equivalence ratio conditions, and flame behavior and stability of the coal gas are observed and furthermore thermal and fuel Nox emission values are measured.
Chan Lee Yong Chul Kim
Department of Mechanical Engineering University of Suwon Hwaseong, 445-743, Korea
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
25-26
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）